Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 30
·8105-8114
·
IF 5.976
Ping Gao,Xiang-Ying Sun,Bin Liu,Hui-Ting Lian,Xin-Qiang Liu,Jiang-Shan Shen
Developing a catalyst with a uniform and well-defined crystal structure is very important to establish a catalytic sensing system with high efficiency. In this work, Cu-BTC metal–organic frameworks (MOFs) without a crystalline CuO or Cu2O phase were successfully synthesized by using a low temperature synthesis method, and the as-prepared Cu-BTC MOFs were found to have outstanding catalytic activity towards the traditional oxidase substrate, o-phenylenediamine (OPD), to generate a colored and fluorescent product. The results of the kinetics analysis revealed that the catalytic behavior of Cu-BTC MOFs towards OPD could well follow the typical Michaelis–Menten equation, indicative of a strong affinity between Cu-BTC MOFs and OPD. On the basis of these findings, taken together the condensation reaction between the –CHO group of formaldehyde and the –NH2 group of OPD to form Schiff base compounds, a novel Cu-BTC MOF-based catalytic sensing system for detecting gaseous formaldehyde could be successfully established.
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BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Liping Kong,Chunze Liu,Ji Gao,Yuanyuan Wang,Liyi Dai
The alcoholysis of Kraft lignin was catalyzed by bimetallic Ni-Cu supported on H-Beta, HZSM-5, MAS-7, MCM-41 and SAPO-11 zeolite materials in isopropanol solvent. Results showed that a higher bio-oil yield of 98.80 wt% and monomer yield of 50.83 wt% without obvious char were achieved at 330 °C for 3 h over Ni-Cu/H-Beta catalyst. Isopropanol was found to be more effective in H 2 generation and facilitated to the hydrodeoxygenation of lignin-derived phenolic compounds. Moreover, the composition of liquid products was also influenced by the acidity and pore structure of catalyst. The superior cycloalkanes yield was produced over Ni-Cu/H-Beta with larger pore size and more acidity. In contrast, a large number of cyclic ketones/alcohols and alkanes were obtained over other zeolites supported catalysts with smaller pore size and less acid content. Besides, the temperature, time and solvent effect on the lignin depolymerization were also researched.
研究领域:
化学工程
·
可再生资源转化
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ACS Omega
·
2020
·
IF 2.87
Ping Fan,Jiahao Tang,Shunxin Jia,Pengbo Liu,Jintao Yang,Feng Chen,Zhengdong Fei,Mingqiang Zhong
Two nanocomposites with a hierarchical structure (GO@CuSilicate@Fe3O4 and GO@Fe3O4@CuSilicate) were fabricated in this paper. These as-synthesized nanocomposites were analyzed for their structural, compositional, and morphological features by X-ray diffraction, scanning electron microscopy (SEM), Raman spectroscopy, and Brunauer–Emmett–Teller methods. SEM images showed that both nanocomposites had a core–shell structure, and their shells were composed of CuSilicate nanoneedle arrays. Further, their total electromagnetic shielding efficiency was measured and compared in a wide frequency range of 8–12 GHz (X-band). Because of the “antenna” role of CuSilicate nanoneedle arrays and the polarization at the interface between graphene oxide (GO) and Fe3O4, GO@Fe3O4@CuSilicate showed higher electromagnetic shielding performance than that of GO@CuSilicate@Fe3O4. With 1 mm thickness, GO@Fe3O4@CuSilicate showed a high electromagnetic shielding efficiency (over 40 dB) in the whole X-band (8.2–12.4 GHz) and reached a maximum value (41.8 dB) at 8.2 GHz. Its total electromagnetic shielding efficiency was mainly contributed by absorption rather than reflection. This study provided an idea for the structural design of high-performance electromagnetic shielding materials in the GHz frequency range (X band).
研究领域:
材料科学
·
电磁学
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Materials Advances
·
2023
·Vol. 5
·期 3
·1234-1239
·
IF 5
Yi Lv,Jing Yang,Haibo Li,Wei Liu,Gangfeng Ouyang
In this paper, the structures and optical properties of copper(I) halide mononuclear hybrids have been studied. Three pairs of compounds with different organic ligands have been synthesized by a precursor approach, exhibiting significantly enhanced stability compared to typical copper halide monomers by the formation of stronger Cu–P bonds, proving that copper halide monomer-type hybrid compounds have the potential to be developed into high-performance light-emitting materials.
研究领域:
材料化学
·
光学材料
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ACS Omega
·
2025
·
IF 4.3
Dongpeng Sun,Shumei Kang,Jinghao Li,Hong Chen,Xintong Li,Hongyan Qi
Copper-based metal–organic frameworks (Cu-MOFs) show great promise in corrosion protection due to their large specific surface area and inherent antibacterial properties. However, when applied to epoxy resin (EP) coatings, their tendency to agglomerate and the instability of the passive films formed during corrosion compromise the anticorrosion performance of the composite materials. To overcome these challenges, this study synthesized a series of zinc–copper bimetallic MOFs (Zn/Cu-MOFs) by incorporating zinc ions with similar ionic radii during the synthesis process. The surface morphology and ion release characteristics of the Zn/Cu-MOFs were comprehensively characterized using FE-SEM, XRD, FTIR, XPS, and ICP-OES. Subsequently, taking Zn10/Cu-MOF (fabricated with a Zn2+-to-Cu2+ volume ratio of 1:9) as an example, the anticorrosion performance of the nanoparticles was assessed in both solution and coating systems. Remarkably, Zn10/Cu-MOF nanoparticles achieved a corrosion inhibition efficiency of 89.7% for carbon steel after 24 h of immersion. Furthermore, electrochemical impedance spectroscopy (EIS) and salt spray tests on the coatings demonstrated that Zn10/Cu-MOFs impart efficient corrosion resistance and self-healing ability to the EP matrix. After 40 days of immersion in 3.5 wt % NaCl solution, the Zn10/Cu-MOF@EP coating exhibited a significantly higher low-frequency impedance modulus (|Z|0.01 Hz ≈ 108 Ω·cm2) compared to Cu-MOF@EP (∼106 Ω·cm2) and pure EP (∼105 Ω·cm2).
研究领域:
材料科学
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腐蚀工程
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纳米材料
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涂层技术
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金属有机框架（MOFs）
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ACS Catalysis
·
2025
·
IF 13.1
Yuan Li,Ruizhe Li,Pingping Rui,Jingwen Cheng,Yunxiang Li,Hong Yuan,Shuxin Ouyang
Fischer–Tropsch synthesis (FTS) offers a route for converting syngas from nonpetroleum resources into valuable chemicals, such as light olefins. χ-iron carbide (χ-Fe5C2), the key active phase for olefin production, is plagued by poor stability under practical conditions. Here, we propose a synthesis-to-catalysis full-process Cu-assisted strategy that integrates synthesis, photothermal conversion and reaction regulation into a design framework, thereby enabling a Cu/Fe5C2@C catalyst with improved durability and catalytic performance. The optimized 0.20Cu/Fe5C2@C catalyst achieves 48.7% light olefins selectivity, a 3.1-fold increase in light olefin yield compared to Fe5C2@C, and markedly improved long-term stability under photothermocatalytic FTS. Mechanistic studies reveal that the full-process synergy of Cu enhances catalytic performance by promoting the formation of a highly graphitized carbon shell to stabilize χ-Fe5C2 during synthesis, enhancing photothermal conversion efficiency via localized surface plasmon resonance, and optimizing reactant activation and the CH2* intermediate transformation toward light olefins. This work establishes a full-process regulation paradigm that integrates multistage functions, offering a transformative approach toward high-performance, durable solar-driven FTS for nonpetroleum resource utilization.
研究领域:
催化化学
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材料科学
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能源化学
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纳米技术
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可持续能源
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Catalysis Science & Technology
·
2015
·Vol. 6
·期 9
·3027-3037
·
IF 5.426
Yanan Liu,Yufei He,Daran Zhou,Junting Feng,Dianqing Li
Aiming at the preparation of catalysts with well-controlled structures, bimetallic PdCu catalysts containing only small amounts of Pd were prepared by two different methods for partial hydrogenation of acetylene. The highly dispersed and stable PdCu catalyst with the Pd : Cu atomic ratio of 1 : 40 was obtained from a Pd(OH)2/CuMgAl hydrotalcite (HT) precursor by a modified co-precipitation method. The obtained PdCu catalyst possessed uniform PdCu nanoalloys with an average size of 1.8 ± 0.3 nm. As a comparison, the impregnation method was also employed to prepare bimetallic PdCu catalysts and it was confirmed that the Pd-rich(core)–Cu-rich(shell) structure was dominant. Under identical reaction conditions, approximately 100% conversion and 82% selectivity at 100 °C were achieved using the PdCu nanoalloy catalyst which were 23% and 12% higher than those of the Pd-rich(core)–Cu-rich(shell) catalyst. The preferable activity was ascribed to the homogeneous nanoalloy structure and small size effect. The enhanced selectivity was attributed to the strong synergistic effect of PdCu. More significantly, this superior catalytic performance can be retained after 48 h of continuous reaction due to the excellent resistibility against carbon deposition and the confinement effect.
研究领域:
催化化学
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材料科学
·
有机合成
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ACS Catalysis
·
2026
·
IF 13.6
Shi Zhanghan,Duan Fangyu,Liu Yafei,Zhang Xianwang,Song Guoquan,Yang Xiaomeng,Ma Qianli,Zhang Zongwu,Wu Dan,Xu Chunbao,Zhang Yongsheng
Cascade catalytic upgrading of biomass-derived furanic compounds to high-value cyclopentanone (CPO) and cyclopentanol (CPL) over metal–acid bifunctional catalysts has attracted considerable attention in sustainable chemistry. However, conventional bifunctional catalysts exhibit insufficient synergistic effects, primarily due to the lack of flexibility in tuning the ratio of acidic to hydrogenative active sites. Herein, we demonstrate that halogen (Br and Cl) modification of supported Cu catalysts significantly enhances both activity and selectivity in the aqueous-phase hydrogenative rearrangement of furfuryl alcohol (FOL), achieving a CPO yield of 94.4% and a CPL yield of 94.6%, respectively. Extensive characterizations reveal that the electronegative Br and Cl adatoms effectively modulate the electronic state of Cu nanoparticles, facilitating the formation of Lewis acidic Cu + sites on the catalyst surface. Mechanistic investigations disclose that Cu + sites mediate the rearrangement of FOL to 4-hydroxy-2-cyclopentenone (4-HCP), while adjacent Cu 0 sites catalyze the hydrogenation of 4-HCP to CPO, followed by its subsequent hydrogenation to CPL. Different binding strengths between Cu and halogens (I > Br > Cl) allow the regulation of the Cu + /Cu 0 ratio on the Cu surface, which in turn provides an effective way to control the reaction pathway. The developed halogen modification strategy not only offers great potential for the upgrading of biomass-derived furanics to cyclopentane derivatives but also presents a versatile strategy for regulating the surface Lewis acidity of metal catalysts, which is crucial for metal–acid bifunctional catalysis.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Hui Xu,Yuhang Zhong,Dingke Wang,Ran Sun,Yujie Tan,Xingang Liu,Jianyuan Hou,Yuan Yuan,Ximan Dong,Renxi Zhang
Cu/Z-700 enables plasma-driven H₂ evolution from simulated seawater vapor. • Dynamic Cu redox cycling acts as an electron relay during plasma catalysis. • Cu clusters, Cu N sites, and pyridinic N perform differentiated functions. • An H₂ rate of 1.33 mL min −1 is achieved with >95% activity after five cycles. How different active sites cooperate under non-thermal plasma (NTP) conditions is still poorly understood. Here, Cu-doped ZIF-8-derived carbon carbonized at 700 °C (Cu/Z-700) is shown to host three distinct active centers: metallic Cu clusters, Cu–N coordinated (Cu–NC) moieties and pyridinic N (Py-N) sites. Cu K-edge X-ray absorption spectroscopy reveals that ~80% of Cu exists as metallic clusters and ~ 20% as isolated Cu δ+ –Nₓ sites. Density functional theory (DFT) calculations suggest a functional division among the three sites: Cu clusters show the strongest Cu–OH binding and the most favorable reaction free energies, Cu–NC sites favor intermediate conversion and product desorption, and Py-N sites promote water adsorption. In a dielectric barrier discharge (DBD), Cu/Z-700 delivers a H₂ production rate of 1.33 mL min −1 from water vapor generated from simulated seawater at a residence time of 3 s, an 11-fold enhancement over plasma alone, with 93.6% activity retention over 20 cycles. Gas-phase product analysis shows that more than 97% of the H₂ originates from water splitting. The results clarify the nature of the active sites in Cu/ZIF-8-derived carbon and their contribution to plasma-catalytic water splitting. Download: Download high-res image (169KB) Download: Download full-size image
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Lei Xiao,Chaowei Yuan,Peng Chen,Yongyi Liu,Jianping Sheng,Shihan Zhang,Fan Dong,Yanjuan Sun
Due to the intrinsic chemically inert CO2 with the dissociation energy of C═O bond as high as 750 kJ mol–1, low efficiency and selectivity have become the most significant restraints for the practical application of photocatalytic CO2 reduction. Renewing the electronic structure of adsorbed CO2 on the catalyst surface through a rational catalyst design is crucial to achieving performance improvement. Herein, we prepared ZnIn2S4 and Cu-substituted ZnIn2S4 containing both Lewis acid and Lewis base sites as a model system for investigating the activation of CO2 by M–S chemical bonds (M represents a metal site). The Cu–S chemical bond can effectively activate CO2 as a vital electron channel and lower the Gibbs free energy for generating the essential intermediate *COOH. Besides, the Cu0.7-ZnIn2S4 sample displays 74.8% selectivity for reducing CO2 to CO with a rate of 47.2 μmol g–1 h–1, roughly 7.14 times that of ZnIn2S4.
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Frontiers in Chemistry
·
2021
·
IF 5.221
Hu Qin,Qin Jie,Wang Xiao-Feng,Ran Guang-Ying,Wang Qiang,Liu Guang-Xiang,Ma Jian-Ping,Ge Jing-Yuan,Wang Hai-Ying
A non-enzymatic electrochemical sensor for glucose detection is executed by using a conductive metal–organic framework (MOF) Cu-MOF, which is built from the 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) ligand and copper acetate by hydrothermal reaction. The Cu-MOF demonstrates superior electrocatalytic activity for glucose oxidation under alkaline pH conditions. As an excellent non-enzymatic sensor, the Cu-MOF grown on Cu foam (Cu-MOF/CF) displays an ultra-low detection limit of 0.076 μM through a wide concentration range (0.001–0.95 mM) and a strong sensitivity of 30,030 mA μM−1 cm−2. Overall, the Cu-MOF/CF exhibits a low detection limit, high selectivity, excellent stability, fast response time, and good practical application feasibility for glucose detection and can promote the development of MOF materials in the field of electrochemical sensors.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Qian Wang,Zhi Yu,Junting Feng,Paolo Fornasiero,Yufei He,Dianqing Li
The production of biofuel 2,5-dimethylfuran (DMF) from an important biomass platform of 5-hydroxymethyl furfural (HMF) involves a complicated reaction pathway due to the competition of C═O hydrogenation and C–O hydrogenolysis; however, the dependence of formed intermediates and catalytic sites needs to be further identified. Herein, we constructed a highly efficient and selective Cu/ZnO-Al2O3 catalyst via reduction of a CuZnAl-layer double hydroxide (LDH) precursor, aimed for studying the effect of Cu0/Cu+ species on forming different intermediates and their synergetic promotional effect on HMF hydrodeoxygenation. As expected, the dependence of formation of different intermediates on the Cu+/Cu0 ratio was observed; notably, Cu/ZnO-Al2O3 with higher Cu+/Cu0 ratio finally gave 90.1% DMF selectivity at 100% HMF conversion, more selective than CuNi/Al2O3 (59.6%) and Cu/MgO-Al2O3 (75.8%) references. By a combined study of in situ IR experiments, the observed correlation between the reaction intermediates and the Cu0/Cu+ site suggests that Cu0 tends to adsorb the C═O bond as well as hydrogen molecule, while the Cu+ site is preferable to adsorb and activate the C–O bond. With the synergy of dual active sites, the Cu/ZnO-Al2O3 catalyst showed both high activity and selectivity to DMF. This work provides deep insight into the nature of active Cu species in multiple functional group biomass platform transformation.
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